To hojgau



E. EGER.

MIXING MACHINE.

APPLICATION FILED MAY 13, 1921.

Patented Au. 29, 1922.

INVENTOR. 5772.); f rst H15 ATTORNEY.

ERNST EGER, or person,

creme.

MIXING MACHINE;

A lication filed May 13,

To all to 7mm it may COW/067% Be it known that I, ERNST Eons, a citizenof the United States, residing at Detroit, in the county or" lVayne andState of Michigan, have invented a new and useful Mixing Machinm 01?which the following is a full, clear, and exact description.

This invention relates to mixing machines in general and those adaptedfor working up rubber compounds in particular. And it is a specificallyditl rent embodiment of the invention disclosed and claimed broadly inmy co-pending application Serial No. $69 119 liled conteniporaneously.

In the machine of my companion appli cation, endwise thrust on the rotoris developed and thrust collars have to be provided to care for thesame. lhe machine oi this application employs opposed coiled bladeswhose reactions or endwise thrusts neutralize or balance one another. inthe machine of thecompanion application also, material is carriedagainst a solid or imperl orate end wall against which it is mashed,lrneadec or rolled. The machine of this application worlrs one batchagainst another.

The objects or the present invention are therefore primarily, to betterthe mechanical elliciency and the blending effect of the typeof mixturedisclosed in the above ma chine of my companion application.

Briefly the invention consists'in a cylindrical container in whichrevolves a rotor having oppositely inclined. blades coiled thereaboutwhich meet intermediate the length of the cylinder.

The invention is illustrated in the accompanying drawings in which Fig.l. is a vertical section longitudinally of apreierred embodiment oi theinvention;

Fig. 2. is a transverse section, and

Fig. 3. is a detailed cross section showing the hollow construction oi apart of the bladed rotor.

in the drawings, supporting standards 1 and 2 have suitably secured orbolted between them a cylinder 3 which may, if desired, be made inhalves divided as indi-' cated at 4.- and suitably bolted together. Thecylinder 3 is circular in cross section throughout its extent and ispreferably cylindrical. The cylinder 3 is provided with chargingopenings 5 and 6 adjacent its ends and with a discharging opening 7 atone Specification of Letters Patent. Patgnted A 0; 29, 1922 1921. SerialNo. 469,118.

side intermediate its ends. These openings, 5. 6, and 7, may be closedin any suitable manner as by the removable plugs or caps indicated.Preferablythe cylinder 3 between the charging openings 5 and 6 isrifled, corrugated or otherwise grooved, as indicated at 8, theremainingend lengths-of the interior oi the cylinder being left smoothas indicated at 9 and 10.

Vi ithin the cylinder 3 is a hollow bladed shaft 11, constituting arotor of the construction shown in detail in Fig. 3. There are twobladed portions 12 and 13 which are oppositely inclined to the axis ofthe rotor. Preferably, but not necessarily, each of the blades 12 and 13is varied in pitch from the end to the center of the cylinder, andlikewise also diminished in diameter. and preferably also each of theblades 12 and i3 is stepped or abruptly reduced in size as indicated at14: and 15 to clear the corrugations 8 flanking the smooth surfaces 9and 10 oi the cylinder which latter may be stripped clean by the endportions of the blades.

The bladed rotor is suitably journalled in the end frames 1 and 2 andmay be driven in any suitable manner as for instance, by the gear 16 andpinion 17. Very desirably also thecylinder is hollowed out as indicatedat 18 and the bladed rotor as indicated at 19, to permit circulating acooling mediuim such as water, through the jackets by piping indicatedat 20 21, 22 and 28, the connection 22 being in communication with anopen ended tube 24: whichv allows the water to flow back the full lengthof the rotor to the exhaust connection 23.

Operation: Material. charged through the openings 5 and 6 will becompelled by the portions of the blades sweeping under it to, move intothe grooved or corrugated por tion oi" the cylinder. These portions ofthe blades closely approaching the smooth walls of the cylinder willinsure compounding of all the ingredients and leave none in the cornersof the cylinder. In the corrugated part of the cylinder, the materialwill be, conveyed axially toward the center of the cylinder. In itspassage more or less shredding by the conjoint action of the blades andthe ritling occurs. In the preferred con struction where thepitchdecreases to a minimun'i at the center oi the cylinder, the two batchesor charges will be worked against each other and a relatively highpressure will be developed. When. the pressure is sufficiently high, thematerial will take the path of least resistance and spread or flow intothe grooves 8, or into the limited space between the sweep of thebladesandtthe cylinder, back towards its ends in a direction oppositeits advance by the respective portions 12 and 13 of the blades. As therotor continues to revolve, thev material thus worked adjacent thecylinder-wallsbacktowards its ends, will necessarily againbebrought intothe zone of action-of the blades and be advanced axially adjacent therotor to the center of the cylinderor chamber. Thus each of the batcheswill be worked-in a more or less elliptical orbit whose end portions atthe center of the cylinder, will insure mixture more or lessof one batchwith the other.

The machine has a very powerful and thorough mixing action, vigorouslycompressing or kneadingit and mashing and spreading it, as-well astubing it through the corrugations lining the interior of the cylinderand cutting and rolling it against theribs between the grooves 8. Themixer is entirely closed-and fumes and powdered material cannot escape.

Afterthe mixing is completed, which ordinarily takes but a few minutes,it may be extruded by tubing it outthrough the opening 7 whose shape maybe varied as desired.

Theforegoing relates to the preferred construction but more or less ofthe advantages of the. invention can be realized with a worm-of uniformdiameter, provided of course the cylinder is correspondingly enlargedatthe center to permit of the return *movement of the material in adirection opposite its'advance by the blades. Less desirably also, thepitch of the blades may be made uniform. Reference should therefore bemade to the claims for an understanding of the scope of the invention.

Having thus described my invention what I claim and desire to protect byLetters Patentis 1. A mixing machine for compounding PltStlCS having 1ncomblnation, a chamber substantially circular in cross sectionthroughout, means whereby it may be charged and discharged, and a rotorin said chamber, said rotor having blades coiled op-- of the chamber andadjacent the axis of the rotor, and of a diameter relative the chamber,permitting flowing of material adjacent the walls of the chamber towardsits oppositeendss 35A mixing machine for compounding plastics having incombination, a chamber substantially circular in cross sectionthroughout, means whereby it may be charged and discharged, and a rotorin said chamber, said rotor having blades coiled oppositely about itsaxis for working the material in an axial direction adjacent the rotorand in the opposite direction adjacent the walls of the chamber, saidchamber being provided intermediatcly with ribs co-operating with theblades of the rotor to shred the material, said ribs defining in pairsgrooves for permitting the material to be forced from the center of thecylinder towards its opposite ends.

a. A mixing machine for compounding plastics having in combination, achamber substantially circular in cross section throughout, meanswhereby it may be charged, and discharged, and a rotor in said chambers,said rotor having blades coiled oppositely about its axis for workingthe material in contrary axial directions adjacent the rotor and inopposite directions adjacent the walls of the chamber, and means forpermitting reduction of the temperature created in the batch during theoperation of the machine;

5. A machine for mixing batches of plastic composition having incombination, a container, and a rotor revoluble therein and providedwith oppositely coiled blades for mushrooming two masses of the materialagainst each other intermediate the length of the cylinder andcompelling the material to travel axially of the container in' oppositedirections within and Without respectively the sweep of the oppositelycoiled blades.

6. A machine for mixing batches of plastic composition having incombination, a container, and a rotor revoluble therein and providedwith oppositely coiled blades for mushrooming two masses of the materialagainst each other intermediate the length of the cylinder andcompelling the material to travel axially of the container in oppositedirections within and Withoutrespectively the sweep of the oppositelycoiledblades, said container being provided with an outlet and a closuretherefor intermediate the length of the cylinder and adjacent thepointWhere the two in asses of material are mushroomed against one another,whereby the mixed batch of material may be discharged from the containerby operation of the rotor.

Signed at Detroit, Mich, this 5th day of May, 1921.

ERNST EGER.

